The December UN Climate Change conference in Paris offers a last chance to reach a deal that would keep global warming from reaching risky levels, says UN climate chief Christiana Figueres. But with greenhouse gasses projected to rise to more than 4 Celsius, can countries even make the necessary cuts? And how will the Paris talks succeed when previous conferences have failed to come up with any concrete pledges? Here to answer these questions is France’s Ambassador at large for climate change for Asia and Oceania, Philippe Zeller.